Generic DNS Tools
https://www.domaintools.com/ (5) Partly free
http://www.dnsstuff.com/ (3) Free
http://mxtoolbox.com/SuperTool.aspx (5) Free
http://dnstools.com/ (2) Free
WhoIs Tools
http://www.callerippro.com/ (?) Not Free
Traceroute Tools
Other Tools
IP Range Intelligence
http://www.afrinic.net/ (Africa Region)
https://www.apnic.net/ (Asia/Pacific Region)
https://www.arin.net/ (Canada, USA, and some Caribbean Islands)
http://www.lacnic.net/ (Latin America and some Caribbean Islands)
https://www.ripe.net/ (Europe, the Middle East, and Central Asia)
https://www.domaintools.com/ (5) Partly free
http://www.dnsstuff.com/ (3) Free
http://mxtoolbox.com/SuperTool.aspx (5) Free
http://dnstools.com/ (2) Free
WhoIs Tools
http://www.callerippro.com/ (?) Not Free
Traceroute Tools
Other Tools
IP Range Intelligence
http://www.afrinic.net/ (Africa Region)
https://www.apnic.net/ (Asia/Pacific Region)
https://www.arin.net/ (Canada, USA, and some Caribbean Islands)
http://www.lacnic.net/ (Latin America and some Caribbean Islands)
https://www.ripe.net/ (Europe, the Middle East, and Central Asia)